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Idempotent sends

Use stable client ids when the transport supports them. Retry failed sends with the same id so duplicates do not create twin bubbles.

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Scope memory per conversation

Store agent state keyed by space.to or message.group?.chatId — not globally per user phone, unless you explicitly want cross-chat memory.

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Failure audit log

Persist app.on("error", …) events with to, code, and message. They indicate deliverability or entitlement issues before users report them.

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Webhook deduplication

When using webhooks, unique-index eventId so at-least-once delivery does not double-charge your agent.